Credit rating agency obligations require continuous monitoring, disclosure of rationale, and prohibition on rating group affiliates. Registered credit rating agencies must enter written agreements with clients, obtain client cooperation, inform clients of assigned ratings, continuously monitor and periodically review ratings, and may withdraw ratings only for specified reasons with those reasons disclosed. They must promptly disseminate rating changes, publish rating definitions and non recommendation statements, make public the rationale for ratings, file the rating process with the Authority, use professional rating committees for decisions, ensure due diligence and fairness, avoid rating their own or group issued securities, and prevent trading on unpublished price sensitive information.